Backup is a struggle for both enterprises and small and medium-size businesses (SMBs). It's a complex ecosystem of backup software, networks, servers, disk arrays, and tape systems. Many firms have difficulty completing backups in the time available, and a large number of backups fail or complete with errors. In addition, there are gaps in backup coverage. SMBs and enterprises often don't protect corporate PCs, and enterprises often don't protect machines at remote offices. Given the headaches associated with backup and the gaps in coverage, many firms are considering an online backup service. An online backup is just the first step toward the delivery of multiple infrastructure-related services — such as disaster recovery, archiving, and security — as software-as-a-service (SaaS).